Slideshow: Cleaning Up After Ourselves

Lance Dohman of Aquatic Environments stands on the Aquamog that he used to help Stanford researchers mix carbon into contaminated sediment around Hunter's Point Naval Shipyard. The researchers hope the carbon will bind to the harmful PCBs in the sediment, keeping them from accumulating in the region's organisms.

Amit Asaravala

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Slideshow: Cleaning Up After Ourselves

Lance Dohman of Aquatic Environments stands on the Aquamog that he used to help Stanford researchers mix carbon into contaminated sediment around Hunter's Point Naval Shipyard. The researchers hope the carbon will bind to the harmful PCBs in the sediment, keeping them from accumulating in the region's organisms.

A sign at Hunter's Point Naval Shipyard warns visitors in multiple languages not to eat fish or shellfish caught in the area. Harmful PCBs have been found in mud flats at the site and are known to bioaccumulate, reaching dangerously high levels in animals farther up the food chain.